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from __future__ import annotations
import datetime
import email.utils
from typing import Optional, cast, Union, TYPE_CHECKING
from urllib.parse import urlparse

from ...rest import HttpResponse, AsyncHttpResponse, HttpRequest
from ...utils._utils import _FixedOffset, case_insensitive_dict

if TYPE_CHECKING:
    from ...runtime.pipeline import PipelineResponse

AllHttpResponseType = Union[HttpResponse, AsyncHttpResponse]


def _parse_http_date(text: str) -> datetime.datetime:
    """Parse a HTTP date format into datetime.

    :param str text: Text containing a date in HTTP format
    :rtype: datetime.datetime
    :return: The parsed datetime
    """
    parsed_date = email.utils.parsedate_tz(text)
    if not parsed_date:
        raise ValueError("Invalid HTTP date")
    tz_offset = cast(int, parsed_date[9])  # Look at the code, tz_offset is always an int, at worst 0
    return datetime.datetime(*parsed_date[:6], tzinfo=_FixedOffset(tz_offset / 60))


def parse_retry_after(retry_after: str) -> float:
    """Helper to parse Retry-After and get value in seconds.

    :param str retry_after: Retry-After header
    :rtype: float
    :return: Value of Retry-After in seconds.
    """
    delay: float  # Using the Mypy recommendation to use float for "int or float"
    try:
        delay = float(retry_after)
    except ValueError:
        # Not an integer? Try HTTP date
        retry_date = _parse_http_date(retry_after)
        delay = (retry_date - datetime.datetime.now(retry_date.tzinfo)).total_seconds()
    return max(0, delay)


def get_retry_after(response: PipelineResponse[HttpRequest, AllHttpResponseType]) -> Optional[float]:
    """Get the value of Retry-After in seconds.

    :param response: The PipelineResponse object
    :type response: ~corehttp.runtime.pipeline.PipelineResponse
    :return: Value of Retry-After in seconds.
    :rtype: float or None
    """
    headers = case_insensitive_dict(response.http_response.headers)
    retry_after = headers.get("retry-after")
    if retry_after:
        return parse_retry_after(retry_after)
    return None


def get_domain(url: str) -> str:
    """Get the domain of an url.

    :param str url: The url.
    :rtype: str
    :return: The domain of the url.
    """
    return str(urlparse(url).netloc).lower()
